/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors */
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --primary-bg: #eef2ff;

    /* Status Colors */
    --success: #10b981;
    --success-bg: #d1fae5;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --info: #3b82f6;
    --info-bg: #dbeafe;

    /* Neutral Colors */
    --bg-body: #f0f2f5;
    --bg-card: #ffffff;
    --bg-sidebar: #1e1e2d;
    --bg-sidebar-hover: #2a2a3e;
    --bg-sidebar-active: #4f46e5;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --text-light: #ffffff;
    --text-sidebar: #a2a5b9;
    --border: #e5e7eb;
    --border-light: #f3f4f6;

    /* Spacing */
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --sidebar-width: 240px;
    --sidebar-collapsed: 64px;
    --topbar-height: 60px;
}

html {
    font-size: 14px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
        'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

input, textarea, select {
    font-family: inherit;
    outline: none;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* ===== Utility Classes ===== */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.gap-4 { gap: 4px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.hidden { display: none !important; }

.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-secondary { color: var(--text-secondary); }

/* ===== Badge ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: 0.2px;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-default { background: #f1f5f9; color: var(--text-secondary); }

/* ===== Button ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: #fff;
    border-color: var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}

.btn-success {
    background: var(--success);
    color: #fff;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-sm {
    padding: 5px 12px;
    font-size: 13px;
}

.btn-icon {
    width: 34px;
    height: 34px;
    padding: 0;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--text-secondary);
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text-primary);
    background: #fff;
    transition: var(--transition);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-tertiary);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: #cbd5e1;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* 美化下拉框 */
.form-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 36px;
    cursor: pointer;
    pr-value-color: var(--text-primary);
}

.form-select option {
    padding: 8px 12px;
    font-size: 14px;
    color: var(--text-primary);
    background: #fff;
}

.form-select option:checked {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 500;
}

.form-select option:hover {
    background: var(--primary-bg);
    color: var(--primary);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
    line-height: 1.6;
}

/* ===== Table ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 13px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    background: #fafbfc;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background: #f8faff;
}

/* ===== Card ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: #fff;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    transform: scale(0.92) translateY(10px);
    transition: var(--transition);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 17px;
    font-weight: 600;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
}

.pagination-info {
    font-size: 13px;
    color: var(--text-secondary);
}

.pagination-controls {
    display: flex;
    gap: 4px;
    align-items: center;
}

.page-ellipsis {
    min-width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--text-tertiary);
    user-select: none;
}

.page-btn {
    min-width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    background: #fff;
    border: 1px solid var(--border);
    transition: var(--transition);
    padding: 0 8px;
}

.page-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg);
}

.page-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow-lg);
    font-size: 14px;
    min-width: 280px;
    animation: toastSlide 0.3s ease;
    border-left: 4px solid var(--primary);
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes toastSlide {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes toastOut {
    to { transform: translateX(120%); opacity: 0; }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.fade-in { animation: fadeIn 0.3s ease; }
.fade-in-up { animation: fadeInUp 0.4s ease; }